i'm trying to add a balance function to an amp (u've prob seen the posts). Nigel told me to add this to the output of the amps, so that the pot would control balance (shown below, but without all the extra bits around the op-amp). it looks good on paper, but doesn't work in real life...
i'm trying to add a balance function to an amp (u've prob seen the posts). Nigel told me to add this to the output of the amps, so that the pot would control balance (shown below, but without all the extra bits around the op-amp). it looks good on paper, but doesn't work in real life...
what doesn't work - the circuit works in general - it mixes, amplifies, and the volume control pots work, but when I tried to add your balance control, it did something a bit strange. instead of making one speaker louder and the other quieter (when the pot was turned) it just made BOTH speakers quiter... which is a bit strange
as for the split supply - i'm using a single 9v PP3, and a a 'Midpoint HT Rail' (diagram below - I hope)
You need to make sure that there's no DC fed to the balance control, otherwise it will upset the DC conditions. On the circuit above, where exactly are you connecting the balance circuit?.
you see the first circuit I posted - where the resistors are connected to the op-amps, there is actually a capacitor between them. Soooooo... on the circuit above - the balance circuit is simply inserted between the cap, and the pot (the pot with 'output' written next to it)
you see the first circuit I posted - where the resistors are connected to the op-amps, there is actually a capacitor between them. Soooooo... on the circuit above - the balance circuit is simply inserted between the cap, and the pot (the pot with 'output' written next to it)
The values you have chosen are too low to go there. You could try your existing values on the input to the pots, depending what it's been fed from. Or use higher values.